Q: I am sachin ,purchase iPad mini but I have problem with apple Id .because I don't have credit card for payment .i have debit card so pl help me

As far as I know debit cards aren't accepted as a valid payment method. There are instructions on this page for how to create an account without giving a credit card number : http://support.apple.com/kb/HT2534

Depending upon what country that you in you might be able to buy iTunes gift cards from Apple or other stores (supermarkets, electronics stores etc) and use those to buy items - but they aren't available in all countries, and they are country-specific (they can only be used in their country of issue

You should be able to use a debit card (MC or Visa)... they are used and accepted anywhere just like a credit card.  I use a debit card on my iTunes account and have been for several years.

These two pages (both updated in December) only mention credit cards, not debit cards :

How to set up an account : http://support.apple.com/kb/HT2731

How purchase are billed : http://support.apple.com/kb/HT5582

Whether they should be mentioned, or whether it means that they can't be used on new accounts, I don't know